Five criminals, led by the charming Professor Marcus, plan a daring daylight robbery whilst posing as classical musicians for octogenarian Mrs. Wilberforce, Marcus' landlady. The heist is pulled off without a hitch, but Mrs. Wilberforce soon deduces the quintet's involvement and the gang find themselves forced to "do 'er' in".
Trivia:
William Rose claimed to have dreamt the whole film from beginning to end.